# Сөрөг тооны удиртгал

Сөрөг тоо гэж юу болох, тэдгээрийг тоон шулуун дээр хэрхэн дүрслэх талаар суралцацгаая.
Here's a number line that should look very familiar. It starts at $0$, then counts up by $1$ from there:
We know that if we were to keep going to the right, we would have $11$, then $12$, and so on.
What happens if we keep going to the left of $0$ though? We get negative numbers! To the left of $0$ is $-1$, then $-2$, then $-3$, and so on:

## Why do we need negative numbers?

Negative numbers help us describe values less than zero.

## Example:

When the temperature is $8^\circ$ below $0^\circ$, it is less than $0$. We can say the temperature is $-8^\circ$.

Хаягууд